package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;


    public static final  String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Override
    public User weChatlogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenId(userLoginDTO.getCode());

//        判斷 openid 是否爲空
        if (openid == null) {
            throw  new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

//        根據 openid 判斷用戶是否為新用戶,是就自動注冊
        User user = userMapper.getByOpenid(openid);

        if (user == null) {
            User newUser = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();

            userMapper.insert(newUser);
        }

        return user;
    }

    private String getOpenId(String code) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");

        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json); // 轉爲對象

        String openid = jsonObject.getString("openid");
        return openid;
    }

}
